Materials Literature
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The phenomenon of stress relaxation, the time decrease of internal stress due to localized flow in a solid under constant uniaxial strain, is viewed in terms of present kinetic theories and available data for metals. Rate equations for shear flow, derived from molecular models of liquids and gases, are reviewed briefl…
Magnetoresistance in single crystals of iron has been studied in fields up to 50 kOe at temperatures from 1°–300°K. Iron whiskers 40–700 μ in diameter grown by the hydrogen reduction fo FeCl2 and having residual resistance ratios ρ300°K/p4.2°K from 200 to 2000 have been used for the experiments. In low fields the magn…
Abstract Zerkleinerungsversuche mit tribolumineszierenden Stoffen zeigen, daß in der Spiralstrahlmühle in Randzonen der Treibstrahlen, und hier bevorzugt auf ihrer Rückseite, zerkleinert wird. In Abhängigkeit vom Durchmesser, von der Anordnung, Anzahl und der Form der Treibstrahldüsen werden die Zerkleinerungsvorgänge…
Abstract A novel and relatively simple procedure is described for the estimation of kinetic parameters in pyrolyses from DTA traces. The expressions derived are tested by utilizing data from experimental thermograms. Calculated values of parameters agree well with reported values.
A photoelastic solution of the distribution of stresses around a centrally located elliptical hole in a plate of finite width subjected to uniform axial loading is presented in this paper. Stress distributions at the boundaries are given for a wide range of the parameters, and stress-concentration factors have been co…
Neutron diffraction experiments under magnetic fields up to 15 kOe are performed on the helimagnetic spinel ZnCr2Se4. For fields of about 3 to 4 kOe, switching of 90° antiferromagnetic domains occurs. In the same field range, there is also a tilting of the spins rotation axis towards the field direction. In the field…
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Abstract The viscosity and osmotic pressure of a fraction of poly-2-vinylpyridine have been measured in various solvents, and the parameters concerning the solubility of this polymer, that is, the osmotic second virial coefficient, A2, the polymer-solvent interaction parameter, μ, and the solubility parameter, δ2, hav…
The present status of our concepts as to the origin of the structure and behavior of permanent magnet materials now in use is discussed. It is shown that domain theory can at least qualitatively explain the properties of all these permanent magnet materials. In some cases quantitative agreement between theory and obse…
A large number of samples of hexagonal ferrite, with planar anisotropy incorporating various metal ions, were synthesized and tested for FMR (ferromagnetic resonance). Measurements were made at room temperature in transmission cavities at frequencies between 10 and 35 Gc/s on magnetically oriented polycrystalline comp…
The pressure derivatives of the two interchain exchange constants in FeCl2·2H2O and CoCl2·2H2O, and of the interlayer exchange constant in FeCl2 and FeBr2 have been obtained from measurements of the respective metamagnetic transition fields in the temperature range 1°–4°K. Hydrostatic pressure to 4 kbar were generated…
Abstract In order to make the kinetic theory of liquid viscosity tractable, an approximate from is suggested for the perturbation of the radial distribution function of a monatomic liquid by a nonuniform flow field. Substitution of this form into the microscopic expression for the pressure tensor yields an equation fo…
Time-index of refraction isotherms for a borosilicate glass in the transformation region have been established. By comparing two quenched glasses of the same index, one quenched after attaining equilibrium at a given temperature and the other quenched from a temperature at which the specimen was approaching a higher v…
Abstract Nickel catalysts reduced with sodium borohydride have been found to be active for the liquid phase dehydrogenation of isopropanol. The activity, per unit weight of catalyst, is at least as high as that of Raney nickel. Promotion of the new catalyts with small amounts of chromium has been explained by an incre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Modification of Structures of Ternary Oxides by Cation Substitution. I. Substitution of Strontium for Barium in Barium Ruthenium Oxide and in Barium Iridium OxidePaul C. Donohue, Lewis Katz, and Roland WardCite this: Inorg. Chem. 1966, 5, 3, 335–338Publication Date (Prin…
Some magnetic resonance properties of hydroxyl protons are described for a variety of sugars and derivatives in dimethyl sulfoxide. Spectral information of this kind is shown to be useful, particularly for differentiating between certain types of interconvertible molecular species. For example, a reducing sugar may be…
Abstract The permeability of ethyl cellulose to water vapor and liquid water was measured as a function of temperature. A change of slope was found in the Arrhenius plots at about 50°C., close to the glass transition. The sorption isotherms showed essentially zero heat of mixing in agreement with other workers. The di…
A magnetostatic model for perpendicular anisotropy (i.e., the anisotropy resulting from the rotation of the magnetization out of the plane of the film) is presented on the basis of columnar grain structure in ferromagnetic thin films. The calculation shows that the anisotropy constant is proportional to the square of…
Oxygen diffusion was measured by the sectioning technique on single‐crystal and polycrystalline specimens of Zr 0.858 Ca 0.142 CO 1.858 . The diffusion coefficient, which may be represented by the equation D = 0.01818 +0.068 ‐0.015 exp ‐ (31, 200 × 4300)/ RT cm 2 /sec agrees with that calculated from the electrical co…
Walmsley has suggested a method whereby one can deduce the relative density of states at the Fermi level for spin-up and spin-down electrons. This method compares the shift in Fermi level with applied magnetic field for a magnetic metal with that of a nonmagnetic metal by measuring the voltage induced across the plate…